campbell's soups give you nutrition, energy, and can help you keep a healthy weight. campbell's. it's amazing what soup can do. >>> we are back with living proof of what appears to be an incredible coincidence. one elementary school where an unusual number of kids come in pairs. so why this one school in this one town in tennessee? kiran chetry went there for us looking for answers. >> i'm hane. >> i'm lane. >> i'm bobby. >> i'm johnny. >> i'm tyler. >> timmy. >> i'm laura. >> i'm eddie. >> kiley. >> abby. >> reed. >> sawyer. >> samantha. >> ashley. >> autumn. >> harris. >> emma. >> jack. >> tina. >> lacy. >> mandy. >> reporter: welcome to castle heights elementary school in lebanon, tennessee. home to 611 students and 15 sets of twins. >> this morning we have a set of our third grade twins going to say our pledges. >> i pledge of allegiance to the flag -- >> what's going on? what's in the water in lebanon? just a coincidence. >> it's unbelievable. puts us on the map. ♪ i'm going down to lebanon ♪ tennessee >> reporter: this tennessee town has no particular claim to fame unti